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Add SD card storage to an Arduino board. Arduino has 512 bytes EEPROM (which does not lose its contents at power off) and 1024 bytes RAM (which contents are lost at power off). To get more storage, a SD-card solution (MMC, secure-digital, micro-SD, etc) is the cheapest way to have a few gigabytes of storage for data logging.
This board uses a secure-digital (SD) card with the Arduino board. The Board uses the "slow" mode (via SPI and without interrupts) and only read/write single sectors (no "burst" modes).